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DE-CARB FREE THICKNESS AND WIDTH OVERSIZE RANGES<br />
Flats and Squares<br />
Size<br />
(inches)<br />
Width - Based on<br />
Thickness (inches)<br />
Thickness<br />
(inches)<br />
Through 4" thick .035 - .077 oversize .015 - .035 oversize<br />
Over 4" thick .062 - .124 oversize .062 - .093 oversize<br />
Rounds - Typical Machining Allowances<br />
Nominal Size<br />
(inches)<br />
Oversize Tolerance<br />
(inches)<br />
1/2 to 3 +0.015 to +0.035<br />
Rough Turned Tolerances: Over 3 thru 6 +0.062 to +0.186<br />
(All rounds 3" diameter and Over 6 thru 7 +0.093 to +0.250<br />
over are supplied with a Over 7 thru 18 +0.090 to +0.375<br />
Rough Turned tolerance) Over 18 +0.125 to +0.5625<br />
MACHINING AND DECARBURIZATION ALLOWANCES<br />
When ordering hot rolled bar stock, allowances must be made for machining in order<br />
to remove all decarburized surface. Decarburization is caused by heating for forging<br />
or rolling, and annealing. To obtain a uniform surface hardness and keep warpage to<br />
a minimum on finished tools, it is necessary to remove all the decarburization from<br />
all surfaces before hardening.<br />
The minimum allowances for machining and the maximum decarburization limits for<br />
rounds, hexagons, octagons, and flats are given in the following tables.<br />
Minimum Allowances Per Side for Machining Prior to<br />
Heat Treatment for Hot Rolled Rounds<br />
Rounds<br />
Ordered Size (inches) Hot Rolled Forged Rough Turned<br />
Up to 1/2, incI. .016 — —<br />
Over 1/2 to 1, incl. .031 — —<br />
Over 1 to 2, incI. .048 .072 —<br />
Over 2 to 3, incI. .063 .094 .020<br />
Over 3 to 4, incI. .088 .120 .024<br />
Over 4 to 5, incl. .112 .145 .032<br />
Over 5 to 6, incl. .150 .170 .040<br />
Over 6 to 8, incl. .200 .200 .048<br />
Over 8 — .200 .072<br />
14-32<br />
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